WSI manufactures all items used with this seal head body but does not manufacture the body itself. This is because KMT has an updated version of PRO III seal head assembly which is superior to the previous 72170157 design. If you need to purchase a new seal head body for your PRO III pump, please contact WSI to discuss special promotional pricing to help you upgrade to the latest design with minimal price difference. To view the new design, see WSI part number SK7219002179.
ADVANTAGE OF THE UPGRADED DESIGN:
The new 7219002179 design features a flat inlet sealing end. This allows for ease of maintenance in lapping and grinding a fresh sealing surface should it become damaged due to contact with the inlet poppet. The inlet ball poppet on the old 72170157 design is recessed into a pocket which makes reworking the pocket much more difficult. This reduces the usable life of the 72165539 seal head body.